锥形槽
用锥形立铣刀加工出的槽，其槽壁向变幅杆中心方向收拢。传统的直槽（无锥度槽）在钛合金上必须分多次走刀加工，而锥形槽一次走刀即可加工完成。对于 20 kHz 的变幅杆，采用夹角为 10° 的立铣刀加工锥形槽，其最窄处的典型宽度为 6.6 mm。
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| 图 1. 锥形立铣刀（mscdirect.com） |
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Tapered slot
A slot that has been machined with a tapered end mill so that the walls of the slot converge toward the center of the horn. Unlike conventional straight (untapered) slots that must be machined in several passes in titanium, tapered slots can be machined in a single pass. For 20 kHz horns, a tapered slot has a typical width of 6.6 mm at the narrowest point using an end mill with a 10° included angle.
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| Figure 1. Tapered end mill (mscdirect.com) |
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